Most of the IRLP systems running run in half-duplex mode. This is because they are either running on a simplex frequency or accessing a repeater through a half duplex radio. Some systems are capable of running full-duplex, but there are a few software and hardware limitations which do not allow the system to run full duplex in its current configuration.

Speak Freely has the ability to run full-duplex, and the IRLP interface board was designed with full duplex operation in mind. Several of the IRLP users have requested that I look further into full duplex linking in the near future.

So as a warning to anybody who may be considering moving to full duplex in the future, PLEASE note you will REQUIRE the following:

• A Creative Labs Sound Blaster 16, AWE32, or AWE64. (ENSURE THAT THE SB16 you purchase is capable of FULL DUPLEX OPERATION)

• A full-duplex radio link with or without hangtime

• A licensed OSS sound driver from www.opensound.com

David Cameron
IRLP Designer
VE7LTD